<?php

define('SERVICES_JSON_SLICE', 1);

define('SERVICES_JSON_IN_STR', 2);

define('SERVICES_JSON_IN_ARR', 3);

define('SERVICES_JSON_IN_OBJ', 4);

define('SERVICES_JSON_IN_CMT', 5);

define('SERVICES_JSON_LOOSE_TYPE', 16);

define('SERVICES_JSON_SUPPRESS_ERRORS', 32);



class Services_JSON

{

	function Services_JSON($use = 0)

	{

		$this->use = $use;

	}



	function utf162utf8($utf16)

	{

		// oh please oh please oh please oh please oh please

		if (function_exists('mb_convert_encoding'))

		{

			return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');

		}



		$bytes = (ord($utf16{0}) << 8) | ord($utf16{1});



		switch (true)

		{

			case ((0x7F &$bytes) == $bytes):

				return chr(0x7F &$bytes);



			case (0x07FF &$bytes) == $bytes:

				return chr(0xC0 | (($bytes >> 6) &0x1F))

				. chr(0x80 | ($bytes &0x3F));



			case (0xFFFF &$bytes) == $bytes:

				return chr(0xE0 | (($bytes >> 12) &0x0F))

				. chr(0x80 | (($bytes >> 6) &0x3F))

				. chr(0x80 | ($bytes &0x3F));

		}

		return '';

	}



	function utf82utf16($utf8)

	{

		// oh please oh please oh please oh please oh please

		if (function_exists('mb_convert_encoding'))

		{

			return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');

		}



		switch (strlen($utf8))

		{

			case 1:

				return $utf8;



			case 2:

				return chr(0x07 &(ord($utf8{0}) >> 2))

				. chr((0xC0 &(ord($utf8{0}) << 6)) | (0x3F &ord($utf8{1})));



			case 3:

				return chr((0xF0 &(ord($utf8{0}) << 4)) | (0x0F &(ord($utf8{1}) >> 2)))

				. chr((0xC0 &(ord($utf8{1}) << 6)) | (0x7F &ord($utf8{2})));

		}

		return '';

	}



	function encode($var)

	{

		switch (gettype($var))

		{

			case 'boolean':

				return $var ? 'true' : 'false';



			case 'NULL':

				return 'null';



			case 'integer':

				return (int) $var;



			case 'double':

			case 'float':

				return (float) $var;



			case 'string':

				$ascii = '';

				$strlen_var = strlen($var);



				for ($c = 0; $c < $strlen_var; ++$c)

				{

					$ord_var_c = ord($var{$c});



					switch (true)

					{

						case $ord_var_c == 0x08:

							$ascii .= '\b';

							break;

						case $ord_var_c == 0x09:

							$ascii .= '\t';

							break;

						case $ord_var_c == 0x0A:

							$ascii .= '\n';

							break;

						case $ord_var_c == 0x0C:

							$ascii .= '\f';

							break;

						case $ord_var_c == 0x0D:

							$ascii .= '\r';

							break;



						case $ord_var_c == 0x22:

						case $ord_var_c == 0x2F:

						case $ord_var_c == 0x5C:

							// double quote, slash, slosh

							$ascii .= '\\' . $var{$c};

							break;



						case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):

							// characters U-00000000 - U-0000007F (same as ASCII)

							$ascii .= $var{$c};

							break;



						case (($ord_var_c &0xE0) == 0xC0):

							// characters U-00000080 - U-000007FF, mask 110XXXXX

							// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

							$char = pack('C*', $ord_var_c, ord($var{$c + 1}));

							$c += 1;

							$utf16 = $this->utf82utf16($char);

							$ascii .= sprintf('\u%04s', bin2hex($utf16));

							break;



						case (($ord_var_c &0xF0) == 0xE0):

							// characters U-00000800 - U-0000FFFF, mask 1110XXXX

							// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

							$char = pack('C*', $ord_var_c,

							ord($var{$c + 1}),

							ord($var{$c + 2}));

							$c += 2;

							$utf16 = $this->utf82utf16($char);

							$ascii .= sprintf('\u%04s', bin2hex($utf16));

							break;



						case (($ord_var_c &0xF8) == 0xF0):

							// characters U-00010000 - U-001FFFFF, mask 11110XXX

							// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

							$char = pack('C*', $ord_var_c,

							ord($var{$c + 1}),

							ord($var{$c + 2}),

							ord($var{$c + 3}));

							$c += 3;

							$utf16 = $this->utf82utf16($char);

							$ascii .= sprintf('\u%04s', bin2hex($utf16));

							break;



						case (($ord_var_c &0xFC) == 0xF8):

							// characters U-00200000 - U-03FFFFFF, mask 111110XX

							// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

							$char = pack('C*', $ord_var_c,

							ord($var{$c + 1}),

							ord($var{$c + 2}),

							ord($var{$c + 3}),

							ord($var{$c + 4}));

							$c += 4;

							$utf16 = $this->utf82utf16($char);

							$ascii .= sprintf('\u%04s', bin2hex($utf16));

							break;



						case (($ord_var_c &0xFE) == 0xFC):

							// characters U-04000000 - U-7FFFFFFF, mask 1111110X

							// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

							$char = pack('C*', $ord_var_c,

							ord($var{$c + 1}),

							ord($var{$c + 2}),

							ord($var{$c + 3}),

							ord($var{$c + 4}),

							ord($var{$c + 5}));

							$c += 5;

							$utf16 = $this->utf82utf16($char);

							$ascii .= sprintf('\u%04s', bin2hex($utf16));

							break;

					}

				}



				return '"' . $ascii . '"';



			case 'array':

				if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1)))

				{

					$properties = array_map(array($this, 'name_value'),

							array_keys($var),

							array_values($var));



					foreach($properties as $property)

					{

						if (Services_JSON::isError($property))

						{

							return $property;

						}

					}



					return '{' . join(',', $properties) . '}';

				}

				// treat it like a regular array

				$elements = array_map(array($this, 'encode'), $var);



				foreach($elements as $element)

				{

					if (Services_JSON::isError($element))

					{

						return $element;

					}

				}



				return '[' . join(',', $elements) . ']';



			case 'object':

				$vars = get_object_vars($var);



				$properties = array_map(array($this, 'name_value'),

						array_keys($vars),

						array_values($vars));



				foreach($properties as $property)

				{

					if (Services_JSON::isError($property))

					{

						return $property;

					}

				}



				return '{' . join(',', $properties) . '}';



			default:

				return ($this->use &SERVICES_JSON_SUPPRESS_ERRORS)

				? 'null'

						: new Services_JSON_Error(gettype($var) . " can not be encoded as JSON string");

		}

	}



	function name_value($name, $value)

	{

		$encoded_value = $this->encode($value);



		if (Services_JSON::isError($encoded_value))

		{

			return $encoded_value;

		}



		return $this->encode(strval($name)) . ':' . $encoded_value;

	}



	function reduce_string($str)

	{

		$str = preg_replace(array(

				// eliminate single line comments in '// ...' form

				'#^\s*//(.+)$#m',

				// eliminate multi-line comments in '/* ... */' form, at start of string

				'#^\s*/\*(.+)\*/#Us',

				// eliminate multi-line comments in '/* ... */' form, at end of string

				'#/\*(.+)\*/\s*$#Us'



		), '', $str);

		// eliminate extraneous space

		return trim($str);

	}



	function decode($str)

	{

		$str = $this->reduce_string($str);



		switch (strtolower($str))

		{

			case 'true':

				return true;



			case 'false':

				return false;



			case 'null':

				return null;



			default:

				$m = array();



				if (is_numeric($str))

				{

					return ((float)$str == (integer)$str)

					? (integer)$str

					: (float)$str;

				}

				elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2])

				{

					// STRINGS RETURNED IN UTF-8 FORMAT

					$delim = substr($str, 0, 1);

					$chrs = substr($str, 1, -1);

					$utf8 = '';

					$strlen_chrs = strlen($chrs);



					for ($c = 0; $c < $strlen_chrs; ++$c)

					{

						$substr_chrs_c_2 = substr($chrs, $c, 2);

						$ord_chrs_c = ord($chrs{$c});



						switch (true)

						{

							case $substr_chrs_c_2 == '\b':

								$utf8 .= chr(0x08);

								++$c;

								break;

							case $substr_chrs_c_2 == '\t':

								$utf8 .= chr(0x09);

								++$c;

								break;

							case $substr_chrs_c_2 == '\n':

								$utf8 .= chr(0x0A);

								++$c;

								break;

							case $substr_chrs_c_2 == '\f':

								$utf8 .= chr(0x0C);

								++$c;

								break;

							case $substr_chrs_c_2 == '\r':

								$utf8 .= chr(0x0D);

								++$c;

								break;



							case $substr_chrs_c_2 == '\\"':

							case $substr_chrs_c_2 == '\\\'':

							case $substr_chrs_c_2 == '\\\\':

							case $substr_chrs_c_2 == '\\/':

								if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||

								($delim == "'" && $substr_chrs_c_2 != '\\"'))

								{

									$utf8 .= $chrs{++$c};

								}

								break;



							case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):

								// single, escaped unicode character

								$utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))

								. chr(hexdec(substr($chrs, ($c + 4), 2)));

								$utf8 .= $this->utf162utf8($utf16);

								$c += 5;

								break;



							case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):

								$utf8 .= $chrs{$c};

								break;



							case ($ord_chrs_c &0xE0) == 0xC0:

								// characters U-00000080 - U-000007FF, mask 110XXXXX

								// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

								$utf8 .= substr($chrs, $c, 2);

								++$c;

								break;



							case ($ord_chrs_c &0xF0) == 0xE0:

								// characters U-00000800 - U-0000FFFF, mask 1110XXXX

								// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

								$utf8 .= substr($chrs, $c, 3);

								$c += 2;

								break;



							case ($ord_chrs_c &0xF8) == 0xF0:

								// characters U-00010000 - U-001FFFFF, mask 11110XXX

								// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

								$utf8 .= substr($chrs, $c, 4);

								$c += 3;

								break;



							case ($ord_chrs_c &0xFC) == 0xF8:

								// characters U-00200000 - U-03FFFFFF, mask 111110XX

								// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

								$utf8 .= substr($chrs, $c, 5);

								$c += 4;

								break;



							case ($ord_chrs_c &0xFE) == 0xFC:

								// characters U-04000000 - U-7FFFFFFF, mask 1111110X

								// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8

								$utf8 .= substr($chrs, $c, 6);

								$c += 5;

								break;

						}

					}



					return $utf8;

				}

				elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str))

				{

					// array, or object notation

					if ($str{0} == '[')

					{

						$stk = array(SERVICES_JSON_IN_ARR);

						$arr = array();

					}

					else

					{

						if ($this->use &SERVICES_JSON_LOOSE_TYPE)

						{

							$stk = array(SERVICES_JSON_IN_OBJ);

							$obj = array();

						}

						else

						{

							$stk = array(SERVICES_JSON_IN_OBJ);

							$obj = new stdClass();

						}

					}



					array_push($stk, array('what' => SERVICES_JSON_SLICE,

					'where' => 0,

					'delim' => false));



					$chrs = substr($str, 1, -1);

					$chrs = $this->reduce_string($chrs);



					if ($chrs == '')

					{

						if (reset($stk) == SERVICES_JSON_IN_ARR)

						{

							return $arr;

						}

						else

						{

							return $obj;

						}

					}

					// print("\nparsing {$chrs}\n");

					$strlen_chrs = strlen($chrs);



					for ($c = 0; $c <= $strlen_chrs; ++$c)

					{

						$top = end($stk);

						$substr_chrs_c_2 = substr($chrs, $c, 2);



						if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE)))

						{

							$slice = substr($chrs, $top['where'], ($c - $top['where']));

							array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));

							// print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");

							if (reset($stk) == SERVICES_JSON_IN_ARR)

							{

								// we are in an array, so just push an element onto the stack

								array_push($arr, $this->decode($slice));

							}elseif (reset($stk) == SERVICES_JSON_IN_OBJ)

							{

								$parts = array();



								if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts))

								{

									// "name":value pair

									$key = $this->decode($parts[1]);

									$val = $this->decode($parts[2]);



									if ($this->use &SERVICES_JSON_LOOSE_TYPE)

									{

										$obj[$key] = $val;

									}

									else

									{

										$obj->$key = $val;

									}

								}elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts))

								{

									// name:value pair, where name is unquoted

									$key = $parts[1];

									$val = $this->decode($parts[2]);



									if ($this->use &SERVICES_JSON_LOOSE_TYPE)

									{

										$obj[$key] = $val;

									}

									else

									{

										$obj->$key = $val;

									}

								}

							}

						}elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR))

						{

							// found a quote, and we are not inside a string

							array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));

							// print("Found start of string at {$c}\n");

						}elseif (($chrs{$c} == $top['delim']) &&

						($top['what'] == SERVICES_JSON_IN_STR) &&

						((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1))

						{

							array_pop($stk);

							// print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");

						}elseif (($chrs{$c} == '[') &&

						in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ)))

						{

							// found a left-bracket, and we are in an array, object, or slice

							array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));

							// print("Found start of array at {$c}\n");

						}elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR))

						{

							// found a right-bracket, and we're in an array

							array_pop($stk);

							// print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");

						}elseif (($chrs{$c} == '{') &&

						in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ)))

						{

							// found a left-brace, and we are in an array, object, or slice

							array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));

							// print("Found start of object at {$c}\n");

						}elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ))

						{

							// found a right-brace, and we're in an object

							array_pop($stk);

							// print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");

						}elseif (($substr_chrs_c_2 == '/*') &&

								in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ)))

						{

							// found a comment start, and we are in an array, object, or slice

							array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));

							$c++;

							// print("Found start of comment at {$c}\n");

						}elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT))

						{

							// found a comment end, and we're in one now

							array_pop($stk);

							$c++;



							for ($i = $top['where']; $i <= $c; ++$i)

								$chrs = substr_replace($chrs, ' ', $i, 1);

							// print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");

						}

					}



					if (reset($stk) == SERVICES_JSON_IN_ARR)

					{

						return $arr;

					}elseif (reset($stk) == SERVICES_JSON_IN_OBJ)

					{

						return $obj;

					}

				}

		}

	}



	/**

	*

	* @todo Ultimately, this should just call PEAR::isError()

	*/

	function isError($data, $code = null)

	{

		if (class_exists('pear'))

		{

			return PEAR::isError($data, $code);

		}elseif (is_object($data) && (get_class($data) == 'services_json_error' ||

				is_subclass_of($data, 'services_json_error')))

		{

			return true;

		}



		return false;

	}

}



if (class_exists('PEAR_Error'))

{

	class Services_JSON_Error extends PEAR_Error

	{

		function Services_JSON_Error($message = 'unknown error', $code = null,$mode = null, $options = null, $userinfo = null)

		{

			parent::PEAR_Error($message, $code, $mode, $options, $userinfo);

		}

	}

}

else

{

	/**

	*

	* @todo Ultimately, this class shall be descended from PEAR_Error

	*/

	class Services_JSON_Error

	{

		function Services_JSON_Error($message = 'unknown error', $code = null,$mode = null, $options = null, $userinfo = null)

		{

		}

	}

}
?>